Articles | Volume 8, issue 23
Special issue:
09 Dec 2008
 | 09 Dec 2008

Characteristics of the NO-NO2-O3 system in different chemical regimes during the MIRAGE-Mex field campaign

Z.-H. Shon, S. Madronich, S.-K. Song, F. M. Flocke, D. J. Knapp, R. S. Anderson, R. E. Shetter, C. A. Cantrell, S. R. Hall, and X. Tie

Abstract. The NO-NO2 system was analyzed in different chemical regimes/air masses based on observations of reactive nitrogen species and peroxy radicals made during the intensive field campaign MIRAGE-Mex (4 to 29 March 2006). The air masses were categorized into 5 groups based on combinations of macroscopic observations, geographical location, meteorological parameters, models, and observations of trace gases: boundary layer (labeled as "BL"), biomass burning ("BB"), free troposphere (continental, "FTCO" and marine, "FTMA"), and Tula industrial complex ("TIC"). In general, NO2/NO ratios in different air masses are near photostationary state. Analysis of this ratio can be useful for testing current understanding of tropospheric chemistry. The ozone production efficiency (OPE) for the 5 air mass categories ranged from 4.5 (TIC) to 8.5 (FTMA), consistent with photochemical aging of air masses exiting the Mexico City Metropolitan Area.

Special issue
Final-revised paper